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Chemical Coordination and Integration

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Class 10 Class 12
Describe parathyroid gland and give its functions.

Parathyroid glands : These are four in number and located just at the back of thyroid gland, one pair each in the two lobes of the thyroid glands. These are of pink colour.

Hormones : These glands secrete parathyroid hormone (PTH) , which is a peptide hormone.

Functions of the hormones :

1. It increases the amount of calcium. It stimulates the resorption of Ca2+  from the digested food and and Ca2+ resorption in the renal tubules. It also the process of demineralization in bones. 

2. It decreases the amount of phosphorous in blood.

3. It plays a significant role in maintaining the calcium balance in the body. 


Name the cells that the thyroid gland is composed of.

The thyroid gland is composed of the following :
i. Follicles
ii. Stromal tissue

Name the largest endocrine gland.

Thyroid gland.

Why is the Parathyroid hormone called hypercalcemic hormone?

PTH or parathyroid hormone is also called hypercalcemic hormone as it increase the calcium level in the blood.

What is goitre?

Goitre is the condition in the the thyroid gland is enlarged and the neck portion becomes swollen .It is due to the deficiency of iodine in our diet which results in the less production and secretion of the thyroid hormones that is hypothyroidism.

Name the endocrine gland which is H shaped.

Thyroid gland.